/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef _HDFS_LIBHDFS3_CLIENT_PACKETHEADER_H_
#define _HDFS_LIBHDFS3_CLIENT_PACKETHEADER_H_

#include "datatransfer.pb.h"

using hadoop::hdfs::PacketHeaderProto;

namespace hdfs {
namespace internal {

class PacketHeader {
public:
    PacketHeader();
    PacketHeader(int packetLen, int64_t offsetInBlock, int64_t seqno,
                 bool lastPacketInBlock, int dataLen);
    bool isLastPacketInBlock();
    bool sanityCheck(int64_t lastSeqNo);
    int getDataLen();
    int getPacketLen();
    int64_t getOffsetInBlock();
    int64_t getSeqno();
    void readFields(const char * buf, size_t size);
    /**
     * Write the header into the buffer.
     * This requires that PKT_HEADER_LEN bytes are available.
     */
    void writeInBuffer(char * buf, size_t size);

public:
    static int GetPkgHeaderSize();
    static int CalcPkgHeaderSize();

private:
    static int PkgHeaderSize;
private:
    int32_t packetLen;
    PacketHeaderProto proto;
};

}
}

#endif /* _HDFS_LIBHDFS3_CLIENT_PACKETHEADER_H_ */
